diff -r 40d94ea51402 -r 48a3a9283f09 mercurial/configitems.py
--- a/mercurial/configitems.py	Tue Feb 06 10:51:15 2018 -0800
+++ b/mercurial/configitems.py	Tue Feb 06 11:08:36 2018 -0800
@@ -574,6 +574,9 @@
 coreconfigitem('experimental', 'update.atomic-file',
     default=False,
 )
+coreconfigitem('experimental', 'sshpeer.advertise-v2',
+    default=False,
+)
 coreconfigitem('extensions', '.*',
     default=None,
     generic=True,